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PlantFiles: Dwarf Horseweed, Fleabane, Hogweed
Conyza canadensis

 
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Family: Asteraceae (ass-ter-AY-see-ay) (Info)
Genus: Conyza (kon-NY-zuh) (Info)
Species: canadensis (ka-na-DEN-sis) (Info)

Synonym:Erigeron canadensis
Synonym:Leptilon canadense

Category:
Annuals
Biennials

Height:
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

Spacing:
24-36 in. (60-90 cm)

Hardiness:
Not Applicable

Sun Exposure:
Full Sun

Danger:
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall

Foliage:
Herbaceous

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Propagation Methods:
From seed; direct sow after last frost

Seed Collecting:
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

By Floridian
Thumbnail #1 of Conyza canadensis by Floridian

By Xenomorf
Thumbnail #2 of Conyza canadensis by Xenomorf

By kennedyh
Thumbnail #3 of Conyza canadensis by kennedyh

By melody
Thumbnail #4 of Conyza canadensis by melody

By melody
Thumbnail #5 of Conyza canadensis by melody

By Equilibrium
Thumbnail #6 of Conyza canadensis by Equilibrium

By Equilibrium
Thumbnail #7 of Conyza canadensis by Equilibrium

There are a total of 8 photos.
Click here to view them all!

Profile:

1 positive
No neutrals
2 negatives

Gardeners' Notes:

RatingAuthorComment
Negative melody On Jan 3, 2005, melody from Benton, KY
(Zone 7a) wrote:

This weed has an amazing ability to flourish and set seed in just about any conditions.

It ranges from nearly 10 feet tall in loamy bottom land to just a few inches high on rocky abandoned lots. In both cases, it sets vast amounts of seeds and is virtually indestructable.

It is invasive and as far as I know, livestock avoid it.

Negative xyris On Nov 2, 2004, xyris from Sebring, FL
(Zone 9b) wrote:

Can we accept that some weeds have little to no garden value? I think this is one of them. I find it growing abundantly only in disturbed areas, and is one of those weeds that is impossible to keep out of a sandy soil garden (and probably other soil types).

Positive cityboy On Oct 27, 2004, cityboy from ft. worth, TX
(Zone 8a) wrote:

Grows well without human intervention. Best planted as a group.

Regional...

This plant has been said to grow in the following regions:

Phoenix, Arizona
Morrilton, Arkansas
Sebring, Florida
Benton, Kentucky
Brookeville, Maryland
Pawling, New York
Terrebonne, Oregon



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